Z. Sun, K.-W. Huang, J. Wu
Org. Lett., 12 (20), 4690-4693, (2010)
Soluble and stable zethrenebis(dicarboximide) (1) was synthesized by an in situ Stille cross coupling/transannular cyclization reaction. 1
showed largely improved photostability and solubility compared with the
very unstable zethrene and it also exhibited far-red absorption and
emission with high photoluminescence quantum yield. Bromination of 1 with NBS/DMF gave its quinone form 2 via an unusual pathway.